bsd/kern/kern_fork.c

138 void thread_set_parent(thread_t parent, int pid);
211  *		!0			pid of child (to parent process)
218  * Note:	After a successful call to this function, the parent process
227  *		changes in the parent state, and, if inheritable, the child
317  * Parameters: parent_proc		parent process of the process being
327  *					parent and the child; the child copies
328  *					the parent address space.
330  *					return actively running in the parent
336  *					borrow the parent task, thread, and
340  *					the child is terminated, and the parent
411 		 * child and the tash/thread/uthread from the parent in
429 		 * vfork(), we would chain our parent at this point (in
447 		 * we referenced from the parent ... with the child
461 		 *	will be running in the "child" which is the parent task
527 		 * When we clone the parent process, we are going to inherit
550 		 * we referenced from the parent ... with the child
564 		 *	will be running in the "child" which is the parent task
594 		 * and thread state and address spaces of their parent process.
602 		 * task_suspend the parent.
619 		 * holding the parent sprlock! Lock ordering is
680  * Description:	"Return" to parent vfork thread() following execve/_exit;
681  *		this is done by reassociating the parent process structure
689  *		rval			Return value to present to parent
693  * Notes:	The caller resumes or exits the parent, as appropriate, after
706 	/* clear vfork state in parent proc structure */
729 		retval[1] = 0;			/* mark parent */
740  * Parameters:	parent_task		parent task
755  *		process 'child'.  If the parent process address space is to
786 	/* Propagate CPU limit timer from parent */
804 	 * inherited from parent
834  * Parameters:	parent			Parent process to fork
842  *		from the parent process.  If successful, the call returns
855  *		the parent process which invoked the fork() system call.
857  * Important:	The child thread_resume occurs before the parent returns;
859  *		deterministic as to whether the parent or child is scheduled
861  *		run to completion prior to the parent running.
869 	retval[1] = 0;		/* flag parent return for user space */
875 		/* Return to the parent */
910  * Parameters:	parent_task		The parent task to be cloned, or
915  *					characteristics of the parent
916  *		parent_proc		The parent process to be cloned
918  *					memory from the parent; if this is
1072  * Description:	Create a new process structure, given a parent process
1075  * Parameters:	parent_proc		The parent process
1192 	 * directly from the parent.
1198 	 * Some flags are inherited from the parent.
1314 	/* Inherit the parent flags for code sign */
1327 	 *	creating a child that is a copy of the parent; since this
1452 		 * XXX of parent thread, so a direct reference to the parent